Whilst I do agree with the clean enough to reload, I can't help but think that have squeaky clean primer pockets would be advantageous during reloading especially with some of those primers that are harder and/or a bit tighter to seat.

I've noticed a difference between Remington and Winchester SRP when reloading RG 5.56 brass. The Remington are more difficult to seat than the Winchester. Having ultra clean primer pockets may make the Remington primers easier to seat ??